Calling device for telephone-exchanges.



PATENTED MAR. 5. 1907.

:F. A. LUNDQUIST. CALLING DEVICE FOR TELEPHONE EXCHANGES.

APPLIOATION FILED JUNE 13. 1904.

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5052566066 EZEZUeIZZO/tfi! I flaw alw w PATENTED MAR. 5, 1907 Y 1 F. A.LUNDQUIS'T. CALLING DEVICE FOR TBLEPHONE EXGHANGES.

APPLICATION FILED JUNE 13. 1904.

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flwwmwz r fwwflwwa No. 846,327. 'PATENTED MAR. 5. 1907.- F. A.LUNDQUIST.

' CALLING DEVICE .FOR TELEPHONE EXCHANGES.

1 APPLICATION FILED JUNE 13, 1904.

6 SHEETS-BHEET 3- l hm No. 846,327. PATENTED MAR. 5, 1907.

P. A. LUNDQUIST. CALLING DEVICE FOR TELEPHONE EXCHANGES.

I APPLICATION FILED JUNEIB, 1904.

6 SHEETS-SHEET 4.

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No. 846,827. PATENTED MAR, 5, 1907. F. A. LUNDQUIST.

CALLING DEVICE FOR TELEPHONE EXCHANGES APPLICATION EILED JUNE13. 1904. v

6 SHEETS-SHEET 5 i X Fig.8.

PATENTED MAR. 5,1907.

F. LUNDQUIST. CALLING DEVICE POE TELEPHONE EXCHANGES.

APPLIOATION FILED JUNE 13, 1904.

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No. \Z.

. Eunwm'r' m Zw/ E my wihizssssz v I 7/ I I i an indicating-p but restsat the UNITED. STATES PATENT OFFICE.

FRANK A. LUNDQUIST, OF CHICAGO, ILLINOIS. CALLING DEVICE FoRTELEPHONE-EXCHANGES.

Specification of Letters Patent. Application filed June 13,1904. SerialNo. 212,325.

Patented March 5,1907.

To all whom it may coiicern. a

Be it known that I, FRANK A. L nn msT, a citizen of the United States ofAmerica, and a resident of Chicago, county of Cook, and State ofIllinois, have invented certain new and useful Improvements in CallingDevices for Telephone-Exchanges, of which the following is aspecification.

My invention relates to calling devices for telephone-exchanges, and hasfor its object improvement in the construction and operation of suchdevices.

In the accompanying drawings, Figure 1 is an elevation of the device.Fig. 2'is an enlarged elevation with the front cover removed and showingthe parts in their normal position. Fig. 3 is a similar elevationshowing the parts as they appear while operating tomake acall. Fig. 4 1san elevation similar to Fig. 2, partly in section and with the frontparts removed, so as to show the interior mechanism. Fig. 5 is a detailin side elevation of some of the contact-making parts of Figs. 2 and 3.Figs. 6 and 7 are sections on lines 6 and 7, respectively, of Fig. 5.-Fig. 8 is a condensed and simplified diagram of cen-' tral-officemechanism adapted to be used in connection with the calling device, andFig. 9 is a diagram representing a series of local stations on twoparty-lines running from the central office.

In they said drawings, C is a box upon the front face of which is anumbered and rotatable dial D, mounted upon a spindle D, .to which it issecured. Aspring D normally holds the dial with its zero-point adjacentto ointer D. This normal osition is determlned by a pin E on the spmdleE, which spindle isconnected to the spindle D by a train of gears, asshown in Fig. 4.

In its normal position the pin E rests .be tween and is held stationaryby the pivoted levers E and E The lever E is normally held inv theposition shown in Fig. 4 by a spring E The lever E has no such sprmg,place at which it is put until moved to a different position.

- The large gear D. is connected to the spindle D by aratchet mechanism(not shown) which permits the spindle to be turned in one directionwithout turning the gear, but which drives the gear when turned in the0p posite direction. I A hand-wheel 'D is the means by which the spindleD and the disk or dial D are the ever E clear of the pin E.

turned'by hand in the directionof the arrow in Fig. 1- without movingthe gear D, which forms part of the train of gearing between spindles Dand E. In doing this the levers 1*] and E do not release the pin E untila further operation. Consequently the dial may he set by hand foranyindication, and it will remain at this place'until it is desired to haveit move. The lever E slot 0 of the plate C, which forms part of theframe that holds the mechanism. On the spindle D is an arm D, which whenthe sp ndle is in its normal position strikes the. lever E and holds itsof the pin E. On the other end of the lever E is a piece of insulation Ewhich when the lever is held in its normal position by. the arm Dstrikes spring 25 and closesit to contact withspring 26. i

Iivoted at a convenient place on theplate C is a lever F, which isnormally held in an elevated position by spring F. On the lever F is aspring F which engages the end of lever E to move it away from springs25 and 26 and from the pin it when the arm D has been moved from itsshown in Fig. .3. shown in Fig. 2, ver F would only without moving leverE 1 Assuming the dial-D. to have been s jet at any indication and thearm D inoved away from lever E then a'depression of the lever F willrelease the pin E, and the said pin will move away from the end of,lever E This motion is by virtue of the spring D opcal; se the spring F2 to yieldv extends through a a lower end in the path normal position,as

erating through the train of gears upon the spindle E. As the pin Eapproaches the lever E from the other side it pushes said lever outward,so that it can pass. Secured to the lever E is a disk E havin anotch E.Pivoted at a convenient point is a lever E,

ada ted to engage the notch E", so as to hold v A spring E furnishes theforce for this holding action. Secured at some-convenient place on the.spindle D is an arm the end of which is indicated by dotted lines at Ein Fig. 4; When the spindle D is at its normal position, the arm 1Lstrikes the lever E and moves it away from the notch E but as soon asthe spindle has been advanced the spring E will throw the lever E intoposition to en age notch E as soon as pin E has moved ever E outward.

The general construction and operation so far described is that the dialD may be set at any indication desired and will remain at that placeuntil released by a pressure on the lever or-ke the dial runs back toits normal position, where it stops and is locked. This stopping andlocking is primarily ell'ected by the arm D pushing the lever 15* intothe path of the pin E and secondarily by the arm E releasing the lever Eso that the spring E may force the end of lever E behind the pin E. Thislast action prevents a rebound of the mechanism when suddenly stopped.

On the spindle E is a ratchet-wheel E, which is connected by means of apawl with a governing device E These parts are so arranged that when thespindle is driven forward by spring D the ratchet-wheel drives thegovernor, and the governor acts to regulate the speed of rotation. Whenthe spindle E is suddenlystopped by pin E and lever E the pawl of thegovernor'ridcs over the teeth of the ratchet-wheel until stopped byfriction. By this means the governor is not instantly stopped, and thepin E is relieved of a corresponding amount of impact; otherwise thegoverning mechanism is of a wellknown form, Also secured on the spindleE is a cam 4,' and supported at a convenient.

.an electrical contact 'with the spring 3 for each rotation of thespindle E. In its normal position the cam is not in contact with thespring The train of gearing between spindles l) and E is so related tothe numbering on the dial D that the cam 4 makes one electrical contactwith the spring 3 for each time the dial moves a distance equal to thatbetween one graduation and the next.

The receiver-hook II is pivoted on ashaft H and when not depressed bythe weight of the receiver It is held in an elevated position by aspring H. Also on the shaft is segment of a gear U, which is moveddownward by a spring H which has one end attached to the segment ll andthe other end to a projection on the hook H. ()n the hook H is a pin 11that projects into aslot II in the segment l-l The spring 11 normallyholds II and 11 in the relative position shown in the drawings; but ifthe segment be restrained from movement when the hook is in its elevatedposition then the hook may be moved downward while the. se ment remainsstationary or moves downward at a slower speed. In such a case the pinI1 travels in the slot ll.

on a stud J is a gear J and three camshaped projections J", J, and J".These parts are all fastened together, and in the diagram Fig. 9 thecams are condensed into one and designated by the numeral 21. The gear.Vmcshes with the segment 11 and by suitable gearing and ratchet-wheelis connected with; an escapemcnt J of these parts is to regulate thespeed of the F. When this release occurs,-

The object downward movement of the segment H While not restricting itsupward movement. Supported at a convenient place are five insulatedcontact-springs which make and.

break electrical connection with the cam-surfaces that turn on the studJ. When the hook I1 is at its lowest pbsition, connection is to thespring 20, the other springs being out of electrical connection. Whenthe hook H is at its highest position, the connection is to springs 28and 40. When the hook is passing between its extreme positions, theconnection is to springs 30 and 31.

Secured t0 the plate 0 is a lever L, having three arms or projections.One of these ,L, is insulated and normally rests adjacent to butseparated from a contact 1. A second one of these arms rests adiacent toa pin F on the lever F. The third arm projects adjacent to a pin J,which is carried by the cam-body that turns on stud J. When the hook His in its lowest position, the pin J engages the lever L and moves thepart L out of connection with the contact I. When the hook rises, thepin J moves away and'leaves Lin condition to be moved by depressinglever F, thus bringing L into contact with I. The lever L stays in theplace it is put until niovedby either pin J or by pin F on lever F.Connection between L and I throws the battery-lire to springs 3 and 30,through either of which impulses are sent by the movement of their adjacent' cam-surfaces.

Upon removing the receiver R from its hook the said hook rises androtates the cam-suil'aces on stud J (21 of Fig, 9) and makes and breaksconnections with the adjacent springs. As there is no battery connectionuntil the lever F has been moved and this movement is not made untilafter the receiver is removed, these contacts are without eflect. Uponthe descent of the hook, however, this is'ditierent, because ordinarilythe lever F has been previously moved. contacts made with springs 30 and31 during the intermediate part of the hook movement are used to sendimpulses forreleasing the switching mechanism at the central oliice. Theescape mechanism is used to prevent these contacts from being made soquickly as to be inefleei ive. If the hook H were rigidly connected tothe segment H, then a sudden or forced descent of thehook would beliable to break or damage the escapement. By making a yieldingconnection between the two the hook may be forced down suddenly withoutcausing the segment Htto move any faster than the spring 11 will carryit against the resistance of the escapement.

It will he observed that electrical contacts are made by the movement ofthe receiverhook, but that they are made through an intermediary and notdirectly. It will also be observed that the speed of these contacts isindependent of the speed of the hook. The

The

particular devices illustrated for this purpose are divided or yieldingconnections between the hook and the actual contact-makers. The resultsobtained are a definite speed of contact-making and immunity frombreakage or damage by accident or careless handling of the hook.

The calling device here illustrated is particularly well adapted for usein exchanges which combine party-line systems with automatic exchanges.For the sake of simplicity in drawings and description, however, I havechosen to illustrate it as connected to the kind of exchange shown in myPatent No. 606,764, issued July 5, 1898. In doing this I have omitted inthe cent-ral-oflice apparatus all parts and connections not necessary toan understanding of the general operation. The central-oflice apparatusconsists of a switching mechanism or each line running out of the officeand a battery and battery-strip common for all switching mechanism. Theswitching mechanism is of the kind shown in my said patent, and consistsof a contactmaker P, that is moved into connection with any one of aseries of contact-points, and

. hence through suitable connections to connection with any otherswitching mechanism.

, The ma net A'is used for advancing the contact-maker P, and the magnetB is used for releasing the mechanism, so that it may rehe sets his dialD at "2,

line from switch N o. 2,

turn to its normal position. One or more local stations may be on eachline that extends from the central office. When there are two or morestations on a line, there will be additional apparatus at the centraloflice, as shown in my previously-mentionedapplication; but as suchadditional apparatus is no part of the present application it isomitted.

Assuming that the subscriber at station N o. 11 on the line from switchN o. 1wishesto call the subscriber at station No. 22 on the he wouldproceedas follows: If there is more than one station on his line, hewill remove his receiver and listen to see if the line is busy. If it isbusy, he restores his receiver and waits. If it is not busy or if thereis no other station on his line, presses the key or lever F, and as soonas the dial returns to normal position he gives two rings with hisgenerator. When through talking, he hangs up his receiver. .The'settingof the dial and the number of rings is areading from the stationnumberin the s stem chosen for illustration. Any system t numbering may beused. When the dial is set at 2, it stays at that place until the key Fis pressed. This gives D strikes lever'E and moves it to sto P E. Eachtime such a contact 15 ma e and permits cam 4 to rotate and make twocontacts with spring 3 before arm impulse flows from the batteryX atcentral through ground to station No.11, 1 L 2 3 4 5 6 7 A 8 9 X. Thismoves the contact-maker P of switch N o. 1 to the second contact, whichconnects to switch No. 2. Operating generator sends a ringing current asfollows: G at station No.11, 1011 1213 141516 P17 18, to switch No.2,1916 151413 1211 Q 20 2111 6 7A 8 9,to switch No.1,8A7 6 5 G. Thisringing-circuit also goes through the other stations on the same linewith station No. 22; but as two rings is assumed as the signal for thatstation other subscribers do not respond. Beginning at station N o. 11,the talking-circuit is as follows: R K 22 11 12131415 161 1718191615141312 11 22 K23R242526272821H67A89,t0 switch No. 1, 8 A 7 6 H 21 2827 26 25 R. When the receiver-hook at the calling-station descends, themass 21 closes connection between springs 30 and 31, when a-current'flows X through ground to station No. 11,

1 L 2 29 30 21 H 6 7 A 8 9 X. This closes spring. 33 to spring 34 while31 is in contact with 21, when a branch of the above current flows from21 31 32 11 12 33 34 B 35 9 X. This releases the switching mechanism andpermits it to return to its normal position. it will be observed thatthis circuit for release passes through L and that this circuit inmaking a call. It thus happens that although the release is accomplishedby the descent of the hook such descent is not eflective to producerelease unless a call has been made. This isto avoid confusion andtrouble when there are several stations on one line. Forv example, ifwhen the subscriber takes off his receiver he finds the linebusy itwould not do for him to release the switching mechanism by han ing uphis receiver, because such action wou (1 cut .out the talking parties.The key F when operated serves as a means for making a call and when notoperated serves as a means for permitting the subscriber to remove andreplace his receiver -without interfering with a busy line.

What I claim is y 1. The combination with a receiver-hook arranged to bedepressed by the weight ofa receiver, and a contact-making device arranged to be operated eachtime that the hook is depressed, of aspring-actuated member by which said contact-making device is operated,a governor mechanism by which the speed of said member is controlled,and a slipping connection between said member and said hook, saidconnection being so arranged that the hook may be depressed at agreater-speed than the movement of said member.

2. The combination with a receiver-hook,

and an arm movable with respect to each other, of a spring arranged tohold the hook and the arm normally at one extreme of their 95 is openunless the key F has been depressed movement with respect to each other,and a contact-making device operated by the movement of the arm when thehook is moving in a direction which would disturb the normal irelationship between the hook and the arm if the arm remainedstationary.

3. The combination with a receiver-hook, an arm, and a slottedconnection between the hook and the arm, said connection being arrangedto permit a limited movement of the arm and hook with respect to eachother, of a spring normally holding the two at one extreme of theirmovement with respect to each other, and a contact-making deviceoperated by the force of said springwhen said hook is being depressed.

4. The combination with a contact-making device, and a source of poweri'or operating it, of a receiver-hook, means by which an ascent of saidhook ill set said device preliminary to the making of a contact thereby,and means by which a descent of said hook will release said device.

5. In a calling device arranged to control the operations of a s itchingmechanism, an indicator adapted to be set tor a required advance of suchswitching mechanism, a contact-making device arranged to send impulsesfor causing such advance, a spring placed under tension by the settingoi said mdieator and arranged to operate said contact-making device, akey for setting said device into operation so as to send the re- ,quiredimpulses and to return the indicator to its normal position, a secondcontactmakmg device and a recelver-hook connected together, and means bywhich a descent of the hook ill cause the second device to send animpulse to the switching mechanism over a different course than thattraversed by the impulses be ore mentioned.

6. The combination with two courses over which impulses may be sent, ofa contactmaking device for sending and an indicator for determining thenumber of impulses to be sent over one of said courses, a secondcontact-making device and a receiver-hook For causing the second deviceto send an impulse over the second course, and an independent governorfor each device for controlling the speed of its movement.

7. The combination with two courses over which impulses may be sent, ota separate contact-maker for each course, an indicator arranged to beset by hand tor the sending of a desired number of impulses over one ofsaid courses, a governor for controlling the speed with which suchimpulses are sent, a receiverhook arranged so that by its descent it illcause an impulse to be sent over the second course. and means by which aforced descent of said hook is prevented from influencing the durat onof the Impulse over the second course.

8. The combination with a receiver-hook, and a contact device arrangedto close one electrical connection when the hook is elevated, to close asecond electrical connection when the hook-is depressed, and totemporarily close an interi'nediate electrical connection while passingfrom the elevated to the depressed position, of means by which a rapiddou nward movement oi the hook is prevented i'rom atlecting the rate ofspeed at which said electrical connections succeed each other.

9. A contaet closing device, a spring for operating it, a governor torcontrolling the speed thereof, means-for stopping the contact-closingdevice when it has made the desired number of contacts, and a slippingconnection between said contact-closing device and said governor wherebythe im act due to stopping said closing device is re need.

10. In a calling device, an indicator adapted to he set for the makingof any desired number oi contacts, a key for starting the making of suchcontacts into operation a circuit normally disconnected from thecontactmaking parts, means by which the move ment of the key i'orstarting the making oh circuit and a second contact-closing device forsending an impulse over the other circuit, means for setting the firstcontact-closing device into operation, a receiver-hook provided withconnections for operating the second contact-closing device, and meansby which the operation of the second contact-closing device ill not sendan impulse over the second circuit until ater impulses have been sentover the first circuit by the first contact-closing device.

12. The com ination with a contact-closing device, a battery. and anormally open connection letween said battery and said contact-closingdevice, a receiver-hook arranged to operate said contact-closing deviceduring its descending movement, and a key arranged to close theconnection letween said battery and said contact-closing device, whensaid hook is in an elevated position.

13., The com ination with a contact-closing device, a battery, and anormally open connection between said battery and said contact-closingdevice, of a receiver-hook, a key arrangedto close the connection letween the l attery and the contact-closing device, when said hook is inan elevated position, and means by which a descent of thevcontact-making device normally disconseparate contact-closing devicefor each circuit, independently-operative means for causing thecontact-closlng devices to send impulses Over their respective circuits,and means by which the second contact-closing device is inoperative tosend an impulse over the second circuit until after the firstcontact-closing device has been operated to send impulses over the firstcircuit. I

15. The combination with a battery, a

nected from said battery, and means for operating said contact-makingdevice, of a telephone-calling device adapted to be operated for theselection of a desired telephone-station, and. means by which theoperation of said calling device will connect said contactmaking deviceto said battery.

16. The combination with a circuit over which impulses may be sent, of acontactmaking device normally disconnected from said circuit, anindicator .arran ed to' be set for the making of any desire number ofcontacts bysaid device, a key for connecting said circuit to said deviceand for starting" said deviceiintoi operation, and a receiver? hookarranged to disconnect saiddevice from said circuit.

17. The combination with one .br'anch'of an electrical circuit, and twoother branches normally disconnected from the first branch, of a key forconnecting the first branch to. the

others so as to form two complete circuits, a contact-maker 1n onecircult for sendmg 1mpulses thereover, an indicator for determining thenumber of impulses to be sent by said contact-maker, means by which amovement of said key to connect the first branch to the others will setsaid contact-maker into operation, a separate contact-maker in thesecond circuit, a receiver-hook arranged to operate the contact-maker inthe second circuit, and

means by which upon the hook operating such ,contact-makerthe makin of acontact thereby will be followed by said hook breaking the connectionbetween the first branch and the other two branches.

18. Thecombination with two normally incomplete circuits and a separatecontactmaker for each, of an indicator; for determining the numb er ofcontacts to be made by one contact-maker, a receiver-hook for causing anoperation of the second contactmaker, a key for closing said circuitselsewhere than at the points at which said contact-makers operate, meansby whicha movement of said key to close said circuits will start thefirst contact-maker into 0 eration, and means by which a descent of saihook to operate the second contact-maker will restore said key to itsnormal position and 7 break the connections made thereby.

Signed at Chicago, Illinois, this 7th day of June, 1904. 1

FRANK A. LUNDQUIST.

Witnesses:

C. L. REDFIELD, C. E. JORDAN.

